diff --git a/biome-api-parse.el b/biome-api-parse.el
index 6295af5..fa005e4 100644
--- a/biome-api-parse.el
+++ b/biome-api-parse.el
@@ -437,8 +437,7 @@ them to biome-api-data.el."
         (insert (pp-to-string
                  `(defconst biome-api-data
                     ',biome-api-parse--data
-                    "open-meteo API docs data.
-Check `biome-api-parse--page' for the format."))
+                    "open-meteo API docs data.\\nCheck `biome-api-parse--page' for the format."))
                 "\n\n"
                 (pp-to-string
                  `(defconst biome-api-timezones
diff --git a/biome-query.el b/biome-query.el
index a1655ac..9aa2603 100644
--- a/biome-query.el
+++ b/biome-query.el
@@ -36,7 +36,7 @@
   :type 'integer
   :group 'biome)
 
-(defcustom biome-query-completing-read-threshold 4
+(defcustom biome-query-completing-read-threshold 6
   "Invoke `completing-read' when there are more than this many choices."
   :type 'integer
   :group 'biome)
@@ -49,6 +49,11 @@ Forecast\" report you can choose between \"daily\" and \"hourly\".  In
 principle, the API can return results for both groups, but they would
 have to be displayed separately.")
 
+(defconst biome-query--split-items '(("timezone" . "time zone")
+                                     ("timeformat" . "time format")
+                                     ("weathercode" . "weather code"))
+  "Items to split into separate words for generating keys.")
+
 (defconst biome-query--ignore-items '("m" "cm")
   "Items to ignore when generating unique keys.")
 
@@ -61,8 +66,9 @@ It is an alist with the following keys:
 - `:params' - alist with parameters, where the key is either nil (for
   global parameters) or the value of `:param' key of the corresponding
   section.
-  In the former case, the value is an alist with values; in the latter
-  case, the value is a list of variable names available in the group.")
+
+In the former case, the value is an alist with values; in the latter
+case, the value is a list of variable names available in the group.")
 
 (defvar biome-query--current-section nil
   "Current section.")
@@ -156,7 +162,6 @@ OBJ is an instance of `biome-query--transient-switch-variable'."
   "Toggle the variable switch on or off.
 
 OBJ is an instance of `biome-query--transient-switch-variable'."
-  (setq my/test obj)
   (let ((new-value (not (oref obj value)))
         (param (oref obj param))
         (api-key (oref obj api-key)))
@@ -199,10 +204,26 @@ OBJ is an instance of `biome-query--transient-date-variable'."
            (alist-get :params biome-query-current))))
   (oset obj value value))
 
+(cl-defmethod transient-init-value ((obj biome-query--transient-variable))
+  "Initialize the value.
+
+OBJ is an instance of `biome-query--transient-select-variable'."
+  (oset obj value
+        (alist-get (oref obj api-key)
+                   (alist-get :params biome-query-current)
+                   nil nil #'equal)))
+
+(cl-defmethod transient-format-value ((obj biome-query--transient-variable))
+  "Format the value of OBJ."
+  (let ((value (if (slot-boundp obj 'value) (slot-value obj 'value) nil)))
+    (if value
+        (propertize
+         (format "%s" value)
+         'face 'transient-value)
+      (propertize "unset" 'face 'transient-inactive-value))))
+
 (defclass biome-query--transient-date-variable (biome-query--transient-variable)
-  ((name :initarg :name)
-   (key :initarg :key)
-   (reader :initform #'biome-query--transient-date-reader))
+  ((reader :initform #'biome-query--transient-date-reader))
   "A transient class to display a date variable.")
 
 (defun biome-query--transient-date-reader (prompt _initial-input _history)
@@ -215,21 +236,15 @@ Returns a UNIX timestamp."
    (org-read-date nil t nil prompt)
    'integer))
 
-(cl-defmethod transient-init-value ((obj biome-query--transient-date-variable))
-  "Initialize the value of the variable switch.
-
-OBJ is an instance of `biome-query--transient-switch-variable'."
-  (oset obj value
-        (alist-get (oref obj key)
-                   (alist-get :params biome-query-current)
-                   nil nil #'equal)))
-
 (cl-defmethod transient-format-value ((obj biome-query--transient-date-variable))
-  "Format the value of OBJ."
+  "Format the value of OBJ.
+
+OBJ is an instance of `biome-query--transient-date-variable'."
   (let ((value (if (slot-boundp obj 'value) (slot-value obj 'value) nil)))
     (if value
         (propertize
          (format-time-string
+          ;; TODO fix
           org-journal-date-format
           (seconds-to-time
            value))
@@ -237,18 +252,10 @@ OBJ is an instance of `biome-query--transient-switch-variable'."
       (propertize "unset" 'face 'transient-inactive-value))))
 
 (defclass biome-query--transient-select-variable (biome-query--transient-variable)
-  ((name :initarg :name)
-   (key :initarg :key)
-   (options :initarg :options)))
+  ((options :initarg :options)))
 
-(cl-defmethod transient-init-value ((obj biome-query--transient-select-variable))
-  "Initialize the value.
-
-OBJ is an instance of `biome-query--transient-select-variable'."
-  (oset obj value
-        (alist-get (oref obj key)
-                   (alist-get :params biome-query-current)
-                   nil nil #'equal)))
+(cl-defmethod transient-infix-value ((obj biome-query--transient-select-variable))
+  (oref obj value))
 
 (cl-defmethod transient-format-value ((obj biome-query--transient-select-variable))
   "Format the value of OBJ."
@@ -266,25 +273,125 @@ OBJ is an instance of `biome-query--transient-select-variable'."
      (propertize "]" 'face 'transient-inactive-value))))
 
 (cl-defmethod transient-infix-read ((obj biome-query--transient-select-variable))
-  (let* ((choices (mapcar
+  "Read the value of OBJ, either with `completing-read' or by toggle."
+  (let* ((options (mapcar
                    (lambda (c) (cons (cdr c) (car c)))
                    (append (oref obj options) (list (cons nil "unset")))))
-         (current-idx (or (cl-position (transient-infix-value obj) choices
+         (current-idx (or (cl-position (transient-infix-value obj) options
                                        :test (lambda (a b) (equal a (cdr b))))
                           -1))
-         (next-idx (% (1+ current-idx) (length choices)))
+         (next-idx (% (1+ current-idx) (length options)))
          (value
-          (if (> (length choices) biome-query-completing-read-threshold)
+          (if (> (length options) biome-query-completing-read-threshold)
               (let* ((choice (completing-read
                               (oref obj description)
-                              choices nil t))
-                     (new-value (cdr (assoc choice choices))))
+                              options nil t))
+                     (new-value (cdr (assoc choice options))))
                 (when (and (null new-value) (not (equal choice "unset")))
                   (user-error "Invalid choice: %s" choice))
                 new-value)
-            (cdr (nth next-idx choices)))))
+            (cdr (nth next-idx options)))))
     value))
 
+(defclass biome-query--transient-number-variable (biome-query--transient-variable)
+  ((min :initarg :min :initform nil)
+   (max :initarg :max :initform nil)
+   (integer :initarg :integer :initform nil))
+  "A transient class to display a number variable.")
+
+(cl-defmethod transient-infix-read ((obj biome-query--transient-variable))
+  "Read the value of OBJ."
+  (let ((prompt
+         (concat
+          (oref obj description)
+          " [Enter "
+          (if (oref obj integer) "integer" "number")
+          (when (and (oref obj min) (oref obj max))
+            (format " between %s and %s" (oref obj min) (oref obj max)))
+          (when (and (oref obj min) (not (oref obj max)))
+            (format " greater than %s" (oref obj min)))
+          (when (and (not (oref obj min)) (oref obj max))
+            (format " less than %s" (oref obj max)))
+          "]: "))
+        ok value)
+    ;; XXX `while' doesn't work well with transient
+    (let ((res (read-from-minibuffer
+                prompt
+                (if (numberp (oref obj value))
+                    (number-to-string (oref obj value))
+                  (oref obj value)))))
+      (if (string-empty-p res)
+          (setq ok t)
+        (if (oref obj integer)
+            (setq ok (string-match-p (rx bos (+ digit) eos) res))
+          (setq ok (string-match-p (rx bos (+ (or digit ".")) eos) res))
+          (when ok
+            (setq value (string-to-number res))
+            (when (and (oref obj min) (< value (oref obj min)))
+              (setq ok nil))
+            (when (and (oref obj max) (> value (oref obj max)))
+              (setq ok nil)))))
+      (if ok value
+        (message "Invalid input") nil))))
+
+(cl-defmethod transient-format-value ((obj biome-query--transient-number-variable))
+  "Format the value of OBJ."
+  (let ((value (if (slot-boundp obj 'value) (slot-value obj 'value) nil)))
+    (if value
+        (propertize
+         (number-to-string value)
+         'face 'transient-value)
+      (propertize "unset" 'face 'transient-inactive-value))))
+
+(defclass biome-query--transient-timezone-variable (biome-query--transient-variable) ()
+  "A transient class to display a timezone variable.")
+
+(cl-defmethod transient-infix-read ((obj biome-query--transient-timezone-variable))
+  "Read the value of OBJ."
+  (completing-read (concat (oref obj description) " ") biome-api-timezones
+                   nil t (oref obj value)))
+
+(defclass biome-query--transient-group-switch (biome-query--transient-select-variable)
+  ((options :initform nil))
+  "A transient class to switch between groups of a query.")
+
+(cl-defmethod transient-infix-value ((obj biome-query--transient-group-switch))
+  (oref obj value))
+
+(cl-defmethod transient-init-value ((obj biome-query--transient-group-switch))
+  (let ((groups (biome-query--section-groups biome-query--current-section)))
+    (oset obj options groups)
+    (oset obj value (alist-get :group biome-query-current))))
+
+(cl-defmethod transient-infix-read ((obj biome-query--transient-group-switch))
+  "Read the value of OBJ."
+  (setq my/test (list (oref obj options) (oref obj value)))
+  (let* ((options (mapcar
+                   (lambda (c) (cons (cdr c) (car c)))
+                   (oref obj options)))
+         (current-idx (cl-position
+                       (oref obj value) options
+                       :test (lambda (a b) (equal a (cdr b)))))
+         (next-idx (% (1+ current-idx) (length options)))
+         (value (cdr (nth next-idx options))))
+    value))
+
+(cl-defmethod transient-infix-set ((obj biome-query--transient-group-switch) value)
+  "Set the value of OBJ to VALUE."
+  (let ((old-value (alist-get :group biome-query-current)))
+    (setf (alist-get :group biome-query-current) value
+          (alist-get :params biome-query-current)
+          (seq-filter
+           (lambda (elem) (not (equal (car-safe elem) old-value)))
+           (alist-get :params biome-query-current)))
+    (setf (oref obj value) value)
+    (transient-update)))
+
+(transient-define-infix biome-query--transient-group-switch-infix ()
+  :class 'biome-query--transient-group-switch
+  :key "S"
+  :description "Switch group")
+
 ;; Layout generation
 
 (defun biome-query--cartesian-product (a b)
@@ -300,6 +407,13 @@ OBJ is an instance of `biome-query--transient-select-variable'."
    a))
 
 (defun biome-query--unique-key-weight (it seq-lengths)
+  "Compute the weight of a unique key candidate IT.
+
+IT is a list of numbers, where each number means to take this
+number of symbols from the start of the corresponding word.
+SEQ-LENGTHS is a list of possible values of IT - if it's 2, then
+the item is a number that can only be taken as a whole, otherwise
+it's the length of the word."
   ;; TODO better weight function
   (cl-loop for take in it
            for length in seq-lengths
@@ -329,6 +443,9 @@ at 3."
         (generated-keys (make-hash-table :test 'equal))
         (max-weight (or max-weight 6))
         (max-words (or max-words 3)))
+    (cl-loop for (key . value) in biome-query--split-items
+             do (setq name-low
+                      (replace-regexp-in-string (regexp-quote key) value name-low)))
     (let* ((items (cl-loop for item in (split-string name-low)
                            if (and (not (member item biome-query--ignore-items))
                                    (< (length res) max-words))
@@ -409,6 +526,63 @@ exclude from the result."
        do (puthash name key keys-by-name)))
     keys-by-name))
 
+(defun biome--query-section-fields-define-infixes (fields keys param infix-name)
+  "Define infixes for FIELDS.
+
+PARAM is the value of `:param' of the section.  INFIX-NAME is the
+prefix for infix names.  KEYS is a hash table mapping field names
+to keys."
+  (cl-loop
+   for field in fields
+   for field-api-key = (car field)
+   for name = (alist-get :name (cdr field))
+   for key = (gethash name keys)
+   for type = (alist-get :type (cdr field))
+   for infix-symbol = (intern (concat infix-name field-api-key))
+   do (eval (pcase type
+              ('checkbox
+               `(transient-define-infix ,infix-symbol ()
+                  :class 'biome-query--transient-switch-variable
+                  :key ,key
+                  :api-key ,field-api-key
+                  :param ,param
+                  :description ,name
+                  :argument ,name))
+              ('date
+               `(transient-define-infix ,infix-symbol ()
+                  :class 'biome-query--transient-date-variable
+                  :key ,key
+                  :api-key ,field-api-key
+                  :description ,name
+                  :prompt ,name))
+              ('select
+               `(transient-define-infix ,infix-symbol ()
+                  :class 'biome-query--transient-select-variable
+                  :key ,key
+                  :api-key ,field-api-key
+                  :description ,name
+                  :options ',(alist-get :options (cdr field))))
+              ((or 'number 'integer 'float)
+               `(transient-define-infix ,infix-symbol ()
+                  :class 'biome-query--transient-number-variable
+                  :key ,key
+                  :api-key ,field-api-key
+                  :description ,name
+                  :integer ,(eq type 'integer)
+                  :min ,(alist-get :min (cdr field))
+                  :max ,(alist-get :max (cdr field))))
+              ('timezone
+               `(transient-define-infix ,infix-symbol ()
+                  :class 'biome-query--transient-timezone-variable
+                  :key ,key
+                  :api-key ,field-api-key
+                  :description ,name))
+              (_
+               `(transient-define-infix ,infix-symbol ()
+                  :key ,key
+                  :description ,name
+                  :argument ,name))))))
+
 (defun biome-query--section-fields-children (fields keys parents cache-key)
   "Get transient laoyut for FIELDS.
 
@@ -419,41 +593,7 @@ the position of the current section in the `biome-api-data' tree."
   (when fields
     (let ((param (seq-some (lambda (s) (alist-get :param s)) parents))
           (infix-name (concat "biome-query--transient-" cache-key "-")))
-      (cl-loop
-       for field in fields
-       for field-api-key = (car field)
-       for name = (alist-get :name (cdr field))
-       for key = (gethash name keys)
-       for type = (alist-get :type (cdr field))
-       for infix-symbol = (intern (concat infix-name field-api-key))
-       do (eval (pcase type
-                  ('checkbox
-                   `(transient-define-infix ,infix-symbol ()
-                      :class 'biome-query--transient-switch-variable
-                      :key ,key
-                      :api-key ,field-api-key
-                      :param ,param
-                      :description ,name
-                      :argument ,name))
-                  ('date
-                   `(transient-define-infix ,infix-symbol ()
-                      :class 'biome-query--transient-date-variable
-                      :key ,key
-                      :api-key ,field-api-key
-                      :description ,name
-                      :prompt ,name))
-                  ('select
-                   `(transient-define-infix ,infix-symbol ()
-                      :class 'biome-query--transient-select-variable
-                      :key ,key
-                      :api-key ,field-api-key
-                      :description ,name
-                      :options ',(alist-get :options (cdr field))))
-                  (_
-                   `(transient-define-infix ,infix-symbol ()
-                      :key ,key
-                      :description ,name
-                      :argument ,name)))))
+      (biome--query-section-fields-define-infixes fields keys param infix-name)
       `(["Fields"
          :class transient-columns
          ,@(thread-last
@@ -544,14 +684,14 @@ SUFFIXES is a list of suffix definitions."
   (cl-loop for child in (alist-get :sections section)
            for group = (alist-get :param child)
            when (and group (member group biome-query-groups))
-           collect group))
+           collect (cons group (alist-get :name child))))
 
 (defun biome-query--reset-report ()
   (interactive)
   (setq biome-query-current
         (copy-tree
          `((:name . ,(alist-get :name biome-query--current-section))
-           (:group . ,(car (biome-query--section-groups biome-query--current-section)))
+           (:group . ,(caar (biome-query--section-groups biome-query--current-section)))
            (:params . nil)))))
 
 (transient-define-prefix biome-query--section (section &optional parents)
@@ -566,13 +706,15 @@ SECTION is a form as defined in `biome-api-parse--page'."
          (append
           '([(biome-query--transient-path-infix)])
           '([(biome-query--transient-report-infix)])
+          (unless parents
+            '([(biome-query--transient-group-switch-infix)]))
           (biome-query--section-layout section parents)
           `(["Actions"
              :class transient-row
              ("q" "Up" transient-quit-one)
              ("Q" "Quit" transient-quit-all)
              ,(unless parents
-                '("r" "Reset" biome-query--reset-report :transient t))])))
+                '("R" "Reset" biome-query--reset-report :transient t))])))
         (transient-setup 'biome-query--section nil nil :scope
                          `((:section . ,section)
                            (:parents . ,parents))))